Dust-collector.



PATENTED DEC. 18, 1906.

P. C. MILLER.

DUST COLLECTOR. APPLICATION FILED APR.17. 1905.

- IINVE/VTOR. 7 6 W 27 TTORNEV H JTNESSES:

UNITEB STATES Parana orricn.

DUST-COLLECTOR.

Specification of Letters Patent.

Patented Dec. 18, 1906.

Application filed April 17, 1905. Serial No. 255,875.

State of Illinois, have invented a certain new and useful Improvement inDust-Collectors, of which the following is a specification.

My invention relates to that class of dustcollectors in which the dustis separated from the air by means of centrifugal force. Indust-collectors of this type where a conical dust-discharge is used itis a wellknown fact that there is a decided ingoing current of air inthe center of the aperture provided for the escape of the purified air,as well as the one provided for the discharge of the dust. The incomingcurrent of air through the dust-dis charge opening sometimes producesthis result where the collector is handling light material: that the twoingoing currents meeting cause a disturbance of the action of theair-currents in the collector, and frequently the dust is drawn to thecenter of the rotating current of air. WVhen this occurs, it is seizedupon by the purified air in its escape and carried with it out throughthe upper opening. Various attempts have been made to remedy this byplacing sometimes one and sometimes a plurality of cones within theconical dust-discharge near the dust-discharge opening. There is,however, no practical way to secure these cones in position. Thesemachines, while comparatively light, are very bulky, and it is customaryto secure these cones by the use of angle-irons let down from thehead,and this necessitates an exceedingly heavy head, and when projected downinto the interior of the dust-collector some six or seven feet, andoften more,the cones vibrate, so it becomes necessary to steady them.The only way to accomplish this is by bracing the cones from the sidewalls of the conical dust-discharge. This is exceedingly bad practice,because of the fact that the braces catch and hold stringy material,such as shavings, &c., and tend to break up the rotating motion.

My invention has for its object to provide a dust-collector in whichthis decidedly serious objection will be overcome and to provide meansfor the prevention of the meeting of the ingoing air-currents, toaccomplish the same in an inexpensive manner, and which will largelyincrease the efficiency of the machine. My method of accomplishing thisdischarge chamber.

may be more readily understood by having reference to the accompanyingdrawings, which are hereunto annexed and are a part of thisspecification, in which Figure 1 is a top or plan'view of my improveddust-collector. Fig. 2 is a cross-section taken on the line X X in Fig.1.

Similar figures refer to similar parts throughout the entiredescription.

In the drawings, 1 is my-improved dustcollector, which is constructed,preferably, of three chambers 2, 3, and 4, the lower part 4 beingconical in shape and serves for the dust- It is provided with adust-discharge opening 5 at its lower extremity. A cylindrical bodyportion 3 is mounted upon the conical dust-discharge. Above thiscylindrical body portion is placed the truncated cone 2, this cone beingprovided with a tangential air-inlet 6 and a head 7. This head is formedwith a central opening 8, which has mounted therein adownwardly-depending pipe or tube 9, which is commonly called 5 atubular guard. This guard is constructed on a taper, the taper runningtoward the outside. At the lower end of the tapering tubular guard Iarrange a disk 10. 'This disk is secured to the tubular guard bymeans ofthe angleirons 11 or some other suitable form of fastening. By the useof the tapering tubular guard 9 it becomes possible to use the disk 10without reducing the efiective area of the escape for purified air orcausing any back pressure on the fan, while the disk 10, mounted in itslower extremity, breaks up the incoming current of air to such an extentthat it is scarcely appreciable. The breaking up of this current of airnecessarily releases the back pressure which it causes upon the fanwhich produces the air-current and by reducing the back pressureincreases the efliciency of the machine. At the same time it is obviousthat the disk effectually prevents the meeting of the two ingoingcurrents of air. At the same time it can be placed there with a slightincrease in the cost of manufacture, and it permits of the use of anextremely light head 7.

Having described my invention, what I regard as new, and desire tosecure by Letters Patent, is

In a dustcollector, the combination with a truncated cone into Which thedust-laden air enters at a tangent, of a sheet-metal body in the largerend. of said tube, said disk being IO portion of cylindrical formmounted upon a rigidly attached to the side Walls of said tube conicaldust-discharge having an aperture at by means of angle-irons, for thepurpose set its loWer end for the discharge of the dust, a forthsubstantially as described.

head mounted upon said truncated cone hav- I ing a downwardly-dependingpipe or tube at PHILIP MILLER its center, said tube extending somedistance Witnesses:

below the inlet-opening, said tube tapering J. H. CARROLL,

toward the outside, a circular disk mounted C. M. BURNAM.

